SACHA PFEIFFER, HOST:The father of a high school shooter in Georgia has been sentenced to 15 years in prison. Colin Gray was convicted by a jury in March of second-degree murder for supplying the AR-15 his son used in the attack. Prosecutors said he'd been planning a school shooting for nearly two years before that. Nine others were also injured, and his father, Colin Gray, was arrested shortly after the shooting. We mentioned earlier that Colt Gray's father, Colin Gray, got a sentence of 15 years for providing the rifle his son used.